Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
ban hanh » ban hang
su sach » so sach, vu sach
duc ban » duc tan, duc van, dua ban
lai va » loai va, dai va, hai va
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thu nang x hoi. hieu van pham duc ban hanh ((lai va) OR (mai va)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu nang x hoi. hieu van pham duc ban hanh ((lai va) OR (mai va)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach thu nang x hoi. hieu van pham duc ban hanh ((lai va) OR (mai va)) triet*.